Scrape any cracked or flaking paint with a paint scraper. Seal any cracks and holes with filler. When dry, sandpaper any roughness or imperfections on the filled areas and other parts of the wall.
Before painting your walls, it is imperative to dust and clean them first. For most surfaces, use a towel or a vacuum cleaner. If very dirty, there are a variety of products on the market, we believe in good old sugar soap, but check the your paint manufacturer’s instructions first.
A high-quality primer will help hide marks on walls. Choose an oil-based primer for walls that have heavy stains.
A damp-sealer will protect walls from rising damp and moisture as it will seal plaster while holding back the penetrating water. You can paint after 24 hours once the damp-sealer has dried.